The calculated distance (air line) between San Lucas Sacatepéquez and Retalhuleu is approximately 68 miles respectively 110 kilometers.
By car or train, the actual journey to Retalhuleu is certainly longer, as only the direct route (as the crow flies) between San Lucas Sacatepéquez and Retalhuleu has been calculated here.
Air line (approximately)
110 kilometers
59 nautical miles